For instance, (REF ) implies that \(CC\left((-1)^{\dim _Z̏} Eu_Z\right)\)  is effective. It is also well known that if \(0\ne \varphi =\chi _{st}(\operatorname{{\mathcal {F}}^{\centerdot }})\)  is a nontrivial constructible function associated to a peverse sheaf \(\operatorname{{\mathcal {F}}^{\centerdot }}\)  on \(X\) , then \(CC(\varphi )\)  is effective (e.g., see [1]}). In particular, \(CC(ic_Z)\)  is effective. Finally, the Behrend function \(\nu _Z\)  has an effective characteristic cycle (see [2]}, [3]}).
